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JEE Mains · Maths · STD 12 - 1. relation and function

माना \(2\) तथा \(1\) घात के दो वास्तविक बहुपद क्रमश: \(f ( x )\) तथा \(g ( x )\) है। यदि \(f ( g ( x ))=8 x ^2-2 x\) तथा \(g ( f ( x ))=4 x ^2+6 x +1\) है, तो \(f (2)+ g (2)\) का मान है।

  1. A \(18\)
  2. B \(28\)
  3. C \(38\)
  4. D \(48\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(18\)

Step-by-step Solution

Detailed explanation

\(f \left( g ( x )=8 x ^{2}-2 x \right.\) \(g\left(f(x)=4 x^{2}+6 x+1\right.\) So, \(g ( x )=2 x -1\) \(g(2)=3\) \(f ( x )=2 x ^{2}+3 x +1\) \(f(2)=8+6+1=15\) Ans. \(18\)
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